OP, in your post you've stated you were willing to compromise but from your subsequent messages I'm not seeing that. You've been given several options that would allow you to compromise with your husband but all I see if heel digging. Does it matter if he's changed his mind? Not really, because the fact is that he's feeling differently about it now. Marriage is compromise, adjusting, and changing to one another's needs. So you've said no to the front room. Then invest in sturdy stand and place it in the basement. But I would recommend that instead of focusing on what he had agreed to do and now he's changing it, focus instead on how to keep your partner...the man you love and live with, happy while at the same time working on solutions for the actual problem. What I gather is the problem is a safety concern. In which case, please respond as to why a sturdy stand is not an option in the front room?
Ultimately, toddler stage is short. Marriage is long and built up resentments last a long time and can lead to dissolution later down the road. Find a compromise that works for both of you, not just yourself. Good luck.